SlideSnack

SlideSnack is a suite of presentation sharing tools that enable you to easily upload and share presentations online. You don't have to email PowerPoint files or worry about your students getting the presentation on time. Simply upload your documents (PowerPoint, Keynote, Word) as PDFs for instant access. Your PDFs are converted into a Flash presentation with recording and sharing options.

The free version has some limitations—it applies a watermark to your presentation, will display only 20 slides per presentation, and is limited to five minutes per slidecast.